Steel tubes for mechanical engineering, machine components and general use

Steel tubes have an irreplaceable role for their unique characteristics, i.e. wide range of sizes, variety of available steel grades and welding ability. Tubes for mechanical engineering and parts of machines are used for manufacturing in various types of machine parts and at the same time they can be used in many other industrial areas.

Possible applications of steel tubes:

pressure vessels
parts and the axis of the machine units
construction elements of machines
basis and supports of machines
design features for storages and containers
fixtures for tools
parts of agricultural machinery
conveyor belts
elements of ships

Steel tubes for mechanical engineering, machine components and general use

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Mechanical tube sizes

OUTER DIAMETER (OD)	10,2 – 139,7 mm

WALL THICKNESS (WT)	0,5 – 16,0 mm

EUROPEAN STANDARDS	EN 10294-1, EN 10297-1, EN 10305-1, DIN 2448, BS 6323/3, NF A 49-311, UNI 4991, UNI 7729, STN/ČSN 42 5715, STN/ČSN 42 5716, and PN-H 74219.

RUSSIAN STANDARDS	GOST 8732

AMERICAN STANDARDS	ASTM A 53 and ASTM A 519

JAPANESE STANDARDS	JIS G 3445

Seamless steel tubes – for mechanical treatment – machine parts and general use

Dimensional	standard	SIZES (OD x WT)
EN	10294-1	10.2 x 0.5 – 139.7 x 16.0 mm
EN	10297-1 (10220)	10.2 x 0.5 – 139.7 x 16.0 mm
DIN	2448	10.2 x 0.5 – 139.7 x 16.0 mm
STN	42 5715	10.2 x 0.5 – 139.7 x 16.0 mm
STN	42 5716	10.2 x 0.5 – 139.7 x 16.0 mm
NF A	49-311	10.2 x 0.5 – 139.7 x 16.0 mm
NF A	49-312	10.2 x 0.5 – 139.7 x 16.0 mm
BS	6323-3	10.2 x 0.5 – 139.7 x 16.0 mm
PN – H	74219	10.2 x 0.5 – 139.7 x 16.0 mm
UNI	7729	10.2 x 0.5 – 139.7 x 16.0 mm
GOST	8732	20.0 x 2.5 – 140.0 x 16.0 mm
ASTM	A519	31.75 x 2.34 – 139.7 x 12.7 mm [1.250 x 0.088 – 5.500 x 0.500 in] [13 – 7/0 GA]
ASTM	A53	10.3 x 1.24 – 114.3 x 13.49 mm [0.405 x 0.049 – 4.500 x 0.531 in] [1/8 – 4 NPS]
JIS	G3445	15.9 x 1.2 – 114.3 x 9.5 mm
UNI	ISO 4200	10.2 x 0.5 – 139.7 x 16.0 mm

Steel grades for tubes intended for mechanical engineering

EN 10297-1 EN 10083-2	E235, E275, E315, E355, E420, E460, E470, E275K2, E355K2, E460K2, E420J2, 20MnV6, 16MnCr5, 20NiCrMo2-2, 25CrMo4, 28Mn6, 30CrMo4, 34CrMo4, 38Mn6, 42CrMo4, C10E, C15E, C15R, C22E, C35E, C45E, C60E.
ASTM A 53/A530 ASTM SA53/SA 530	Grade A, Grade B.

Seamless steel tubes – for mechanical treatment – machine parts and general use

Standard	TDC	Steel grade (open product)
JIS	G3445	STKM12A
JIS	G3445	STKM16A
JIS	G3445	STKM14A
JIS	G3445	STKM17C
JIS	G3445	STKM13B
JIS	G3445	STKM13C
JIS	G3445	STKM14C
JIS	G3445	STKM15C
JIS	G3445	STKM16C
JIS	G3445	STKM19A
JIS	G3445	STKM12C
JIS	G3445	STKM20A
JIS	G3445	STKM14B
JIS	G3445	STKM19C
JIS	G3445	STKM12B
JIS	G3445	STKM15A
JIS	G3445	STKM13A
JIS	G3445	STKM11A
JIS	G3445	STKM17A
JIS	G3445	STKM18B
JIS	G3445	STKM18A
JIS	G3445	STKM18C
ASTM	A53/A530	Grade B
ASTM	A53/A530	Grade A
ASTM	A519	1030
ASTM	A519	1018
ASTM	A519	MTX1020
ASTM	A519	1524
ASTM	A519	1518
ASTM	A519	MT1015
ASTM	A519	1035
ASTM	A519	1541
ASTM	A519	1021
ASTM	A519	1012
ASTM	A519	1022
ASTM	A519	1019
ASTM	A519	1016
ASTM	A519	1026
ASTM	A519	1040
ASTM	A519	1020
ASTM	A519	1010
ASTM	A519	MT1010
ASTM	A519	1008
ASTM	A519	1045
ASTM	A519	MTX1015
ASTM	A519	1015
ASTM	A519	1025
ASTM	A519	1050
ASTM	A519	1017
ASTM	A519	MT1020
GOST	8731 / 1050	10
GOST	8731 / 1050	45
GOST	8731 / 1050	35
GOST	8731 / 1050	20
GOST	8731 / 19281	09G2S
STN	42 0250	11 550
STN	42 0250	12 050
STN	42 0250	12 060
STN	42 0250	11 523
STN	42 0250	11 353
STN	42 0250	11 550
STN	42 0250	11 650
STN	42 0250	11 453
STN	42 0250	12 060
STN	42 0250	11 523
STN	42 0250	12 040
STN	42 0250	11 503
STN	42 0250	11 353
STN	42 0250	11 453
STN	42 0250	11 503
STN	42 0250	11 650
STN	42 0250	12 050
STN	42 0250	12 040
EN	10297-1	E355K2
EN	10297-1	E460K2
UNI	7729	Fe 540
PN – H	74219 / 84019	55
EN	10297-1	20NiCrMo2-2
NF A	49-311	TU 56-b
EN	10297-1	30CrMo4
UNI	663	Fe 52-2
UNI	663	Fe 52-1
EN	10297-1	25CrMo4
EN	10297-1	42CrMo4
BS	6323-1,3	HFS 4
EN	10083-2	C22E
EN	10294-1	20MnV6+AR
ČSN	42 0250	11 453
EN	10083-2	C35R
EN	10297-1	C60E
ČSN	42 0250	11 523
DIN	17204	Cm 35
EN	10084	C10E
EN	10083-2	C22
UNI	663	Fe 45-2
EN	10297-1	E420J2
EN	10297-1	E355
EN	10083-2	C30E
ČSN	42 0250	11 453
ČSN	42 0250	11 503
EN	10294-1	E355+N
ČSN	42 0250	11 550
DIN	1630	St 37.4
DIN	17204	C 55
EN	10294-1	E355+AR
DIN	1629	St 37.0
DIN	17204	Ck 45
ČSN	42 0250	12 060
DIN	1629	St 52.0
ČSN	42 0250	11 650
PN – H	74219 / 84019	45
ČSN	42 0250	12 050
EN	10297-1	E470
EN	10083-2	C30R
DIN	17204	C 22
EN	10083-2	C40E
EN	10083-2	C35E
EN	10083-2	C35
DIN	1630	St 52.4
DIN	17204	Ck 55
DIN	17200	Cm 55
ČSN	42 0250	11 650
EN	10297-1	E235
EN	10084	C10R
UNI	663	Fe 35-2
EN	10297-1	E315
ČSN	42 0250	12 060
EN	10083-2	C40
DIN	17210	Ck 10
PN – H	74219 / 84023	R35
EN	10083-2	C40R
EN	10297-1	38Mn6
ČSN	42 0250	12 050
DIN	17210	Ck 15
EN	10084	C15E
PN – H	74219 / 84019	35
EN	10083-2	C55R
EN	10297-1	E275K2
DIN	17204	Cm 45
UNI	663	Fe 55-1
DIN	17210	C 10
EN	10294-1	20MnV6+N
DIN	17204	C 35
PN – H	74219 / 84023	R55
EN	10297-1	34CrMo4
EN	10084	C16R
PN – H	74219 / 84018	18G2A
BS	6323-1,3	HFS 8
DIN	1629	St 44.0
ČSN	42 0250	11 550
EN	10083-2	C25R
ČSN	42 0250	11 523
EN	10083-2	C22R
EN	10083-2	C30
DIN	17210	16MnCr5
NF A	49-312	S 470M
EN	10083-2	C45E
ČSN	42 0250	12 040
ČSN	42 0250	11 503
PN – H	74219 / 84023	R45
NF A	49-311	TU 37-b
PN – H	74219 / 84023	R65
EN	10084	C16E
UNI	7729	Fe 360
DIN	17204	C 45
EN	10297-1	E275
DIN	17210	Cm 15
EN	10083-2	C45
DIN	17210	C 15
PN – H	74219 / 84019	20
BS	6323-1,3	HFS 3
UNI	663	Fe 45-1
BS	6323-1,3	HFS 5
EN	10084	C15R
EN	10083-2	C25
EN	10083-2	C55E
ČSN	42 0250	12 040
DIN	1630	St 44.4
EN	10083-2	C25E
PN – H	74219 / 84018	18G2
UNI	7729	Fe 510
EN	10084	16MnCr5
PN – H	74219 / 84019	10
EN	10083-2	C50R
EN	10083-2	C55
EN	10083-2	C45R
ČSN	42 0250	11 353
ČSN	42 0250	11 353
UNI	663	Fe 35-1
NF A	49-312	S 450MG2
EN	10083-2	C50
NF A	49-311	TU 52-b
NF A	49-311	TU XC 35
DIN	17204	Ck 35
EN	10083-2	C50E
DIN	17204	Ck 22
DIN	17204	Cm 22
EN	10083-2	28Mn6
UNI	663	Fe 55-2

Tube lengths for mechanical engineering

Usually the tubes are supplied in the production length (5 to 6 meters). A precise length may be supplied upon request.

Tube testing

According to EN 10294 – 1 standards the tubes are subjected to specific testing which consists of:

a, cast analysis,
b, tensile test and notched impact strength test (where possible),
c, dimensional inspection,
d, visual inspection.

Additionally according to the EN 10297 – 1 we can provide:

a, nonspecified testing for the steels grade 2.1.1 if by choice there is no agreement about a specific test
b, specific testing for other grades of steel.

The mandatory tests for nonspecified testing are in concurrence with the EN 10294-1, the optional tests are shown in the standards.

Tube surface protection

While ordering, it is necessary to agree upon the method and means of temporarily protecting the surface of the tubes during transportation and storage.

The tubes may be supplied without temporarily preservation of the surface or with an agreed upon preservative.

Tube ends

The tubes with deburred ends or ends customized for welding.

The ends are vertical to the longitudinal axis and are without burrs.

Deburring applies to:

Tube OD: 26,7 – 114,3 mm
Tube WT: 3,2 – 12,5 mm
Tube lengths: 4 – 13 m
Deburring angle, α (alpha): 30°+5°, 37,5°±2,5°
Dimension, c: 1,6 ± 0,8 mm

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Packaging of mechanical tubes

(a) tubes bound with a steel band,
(b) tubes wrapped in plastic sheets, burlap,
(c) tubes in wooden crates.

Tubes are supplied in packages with a circular or hexagonal outline with weight of 300 to 3 500 kilograms.

Marking of tubes and tube bundles

(a) without marking,
(b) marked with colored stripes on the tubes (tube bundles),
(c) marked with spray either by a white or black color using InkJet,
(d) marked by stamping the data (this applies to OD > 22 mm and WT >2.3 mm).

Certified test reports

Certified test reports are issued according to the appropriate TDC standards:

		EN 10204, for EN 10294-1		certificate 3.1.B,

		EN 10297-1		(a) nonspecified testing 2.1 and 2.2, (b) specified testing – 3.1.B or others

Tube straightness

1.5 x 1000 is the required straightness for the tubes that have diameter up to 33.7 mm and which are intended for machine components.

For tubes that are going to be mechanically machined the required straightness is 1: 1000, i.e. 0.001 x L.

The condition, delivery and surface

Hot rolled tubes made out of carbon steel do not go through further heat treatment and their condition is the same as the condition of normally annealed tubes.

After forming, the cold drawn tubes are heat treated in such a way that they would meet the requirements of the appropriate standards as far as the condition of delivery and the mechanical values are concerned.

The inner and outer surface of the tubes corresponds to the manufacturing means.

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Steel tubes for mechanical engineering, machine components and general use

Mechanical tube sizes

Seamless steel tubes – for mechanical treatment – machine parts and general use

Steel grades for tubes intended for mechanical engineering

Seamless steel tubes – for mechanical treatment – machine parts and general use

Tube lengths for mechanical engineering

Tube testing

Tube surface protection

Tube ends

Packaging of mechanical tubes

Marking of tubes and tube bundles

Certified test reports

Tube straightness

The condition, delivery and surface

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